Currently, I have to create a new file in order to have my preferences applied, or for me to even see what the altered preferences look like. Changed preferences can't be applied to already created documents, which is unlike word processors, for example. Please consider a function like "Apply changes to the current document". I suggest having a look at an app such as Musescore scoring app to see how it handles general preferences in real-time. Thanks, Sam

PS: There doesn't appear to be Preferences for adjusting the font size of the fret numbering and adjusting the alignment of Headers/Footers, options which are available in the right-hand panel.